Touchstone

Bitcoin-anchored, tamper-evident audit log for AI agents — record, disclose and verify actions.

What does this entry provide?

Touchstone is an MCP server entry in ChatHome Skills, sourced from Official MCP Registry and scored 67/100. As a Model Context Protocol server, it exposes tools that MCP-compatible LLM clients such as Claude, Cursor, and Copilot can call directly, extending an agent's reach beyond its built-in capabilities. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding Touchstone to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.

Snapshot facts

Source: Official MCP Registry
Quality: 67/100
Install method: streamable-http
Repo: Touchstone-CV/touchstone-mcp
Repo updated: Jul 10, 2026

Install command

mcp add cv.touchstone/touchstone https://touchstone.cv/mcp

Install method: streamable-http

Review the upstream source before running this command.

GitHub project Homepage

Quality

Repo stars

Repo updated

Jul 10, 2026

How is this score calculated?

Weighted across six dimensions, scored 0-100.
Provenance (25): listed in an official or curated registry.
Installability (25): a runnable install command beats a declared transport, which beats a source checkout.
Maintenance (20): recency of the last push; archived entries score zero here.
Adoption (20): repository stars on a log curve.
Documentation (10) and description quality (10): parsed manifest or SKILL.md frontmatter, and a real description rather than a placeholder.

MCP manifest

{
  "_meta": {
    "io.modelcontextprotocol.registry/official": {
      "status": "active",
      "isLatest": true,
      "updatedAt": "2026-07-10T10:58:24.846379Z",
      "publishedAt": "2026-07-10T10:58:24.846379Z",
      "statusChangedAt": "2026-07-10T10:58:24.846379Z"
    }
  },
  "server": {
    "name": "cv.touchstone/touchstone",
    "title": "Touchstone",
    "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
    "remotes": [
      {
        "url": "https://touchstone.cv/mcp",
        "type": "streamable-http",
        "headers": [
          {
            "name": "Authorization",
            "isSecret": true,
            "isRequired": true,
            "description": "A Touchstone API key as 'Bearer tsk_...' — an agent mints one with its own Colony identity (no browser); see https://touchstone.cv/developers"
          }
        ]
      }
    ],
    "version": "1.1.0",
    "packages": [
      {
        "version": "0.3.1",
        "transport": {
          "type": "stdio"
        },
        "identifier": "@touchstone-cv/mcp",
        "registryType": "npm",
        "registryBaseUrl": "https://registry.npmjs.org",
        "environmentVariables": [
          {
            "name": "TOUCHSTONE_RECORDER",
            "isRequired": true,
            "description": "Recorder public id (rec_...) to append to."
          },
          {
            "name": "TOUCHSTONE_SUBJECT",
            "isRequired": true,
            "description": "The subject Colony sub whose key signs entries."
          },
          {
            "name": "TOUCHSTONE_API_KEY",
            "isSecret": true,
            "isRequired": true,
            "description": "Touchstone API key (tsk_...) for the append/disclose REST calls."
          },
          {
            "name": "TOUCHSTONE_SIGNING_KEY",
            "isSecret": true,
            "description": "Base64 Ed25519 seed. Signs locally — the key never leaves your machine. Use this or TOUCHSTONE_KEY_FILE."
          },
          {
            "name": "TOUCHSTONE_KEY_FILE",
            "description": "Path to a file holding the base64 Ed25519 seed (alternative to TOUCHSTONE_SIGNING_KEY)."
          },
          {
            "name": "TOUCHSTONE_BASE_URL",
            "description": "Override the Touchstone API base URL (defaults to https://touchstone.cv)."
          }
        ]
      }
    ],
    "repository": {
      "url": "https://github.com/Touchstone-CV/touchstone-mcp",
      "source": "github"
    },
    "description": "Bitcoin-anchored, tamper-evident audit log for AI agents — record, disclose and verify actions."
  }
}

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